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n in (-oo:+oo)
65/36 = 5*n-((5/6)*n)+5/9 // - 5*n-((5/6)*n)+5/9
(5/6)*n-(5*n)+65/36-(5/9) = 0
(5/6)*n-5*n+65/36-5/9 = 0
5/4-25/6*n = 0 // - 5/4
-25/6*n = -5/4 // : -25/6
n = -5/4/(-25/6)
n = 3/10
n = 3/10
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